20039390 has 32 divisors (see below), whose sum is σ = 42107904. Its totient is φ = 6723360.

The previous prime is 20039389. The next prime is 20039399. The reversal of 20039390 is 9393002.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20039399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245 + ... + 6335.

It is an arithmetic number, because the mean of its divisors is an integer number (1315872).

Almost surely, 2^20039390 is an apocalyptic number.

20039390 is an abundant number, since it is smaller than the sum of its proper divisors (22068514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20039390 is a wasteful number, since it uses less digits than its factorization.

20039390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6152.

The product of its (nonzero) digits is 1458, while the sum is 26.

The square root of 20039390 is about 4476.5377246260. The cubic root of 20039390 is about 271.6198463146.

The spelling of 20039390 in words is "twenty million, thirty-nine thousand, three hundred ninety".